Perennials That Stay Outdoors - Knowledgebase Question

I live in a small townhouse. I have a small patio where I have lots of pots for plants of varoius sizes. I am looking for some flowering perennials (come back year after year) that I don't have to bring inside in the winter, since I don't have the room. I love the cala lilies and begonia's. If I plant them in the spring, will they bloom all summer then return the following summer? If not could you please recommend a flowering plant that will. I also have hanging baskets that I would be filling also.

Unfortunately, calla lilies and begonia are not winter hardy so they will not do in this case. Perennials are sometimes difficult to overwinter in pots, even if they are winter hardy, because you still need to insulate their roots. Using larger pots such as half barrels, or moving the pots to an unheated garage, or piling mulch around them or sinking the pot in the ground for the winter or even packing it in a styrofoam cooler along with dried leaves or straw are all methods of trying to insulate the roots. Most perennials bloom for just a few weeks each year, so you'll want a variety of plants. Some to consider would be dianthus, daylilies (look for reblooming varieties), yarrow, cosmos, purple coneflower, and sedums. Unfortunately, most perennials have too large a root system for the typical hanging basket, but you might try some of the herbs such as thyme or oregano or possibly the tiny strawberry varieties such as "Pink Panda".